CVE-2022-26362
Severity CVSS v4.0:
Pending analysis
Type:
CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Publication date:
09/06/2022
Last modified:
07/11/2023
Description
x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited.
Impact
Base Score 3.x
6.40
Severity 3.x
MEDIUM
Base Score 2.0
6.90
Severity 2.0
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:* | ||
| cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | ||
| cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* | ||
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
To consult the complete list of CPE names with products and versions, see this page
References to Advisories, Solutions, and Tools
- http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html
- http://www.openwall.com/lists/oss-security/2022/06/09/3
- http://xenbits.xen.org/xsa/advisory-401.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/
- https://security.gentoo.org/glsa/202208-23
- https://www.debian.org/security/2022/dsa-5184
- https://xenbits.xenproject.org/xsa/advisory-401.txt